added wait functionality

driver/io-unix.h

@@ -183,6 +183,8 @@ public:
 
 	void poll() override { pollImpl(0); }
 
+	void wait() override { pollImpl(-1); }
+
 	void subscribe(IFdOwner &owner, int fd, uint32_t event_mask) {
 		if (epoll_fd < 0 || fd < 0) {
 			return;

source/async.cpp

@@ -181,14 +181,43 @@ bool EventLoop::turn() {
 }
 
 bool EventLoop::wait(const std::chrono::steady_clock::duration &duration) {
-	return false;
+	if (event_port) {
+		event_port->wait();
+	}
+
+	while (head) {
+		if (!turn()) {
+			return false;
+		}
+	}
+	return true;
 }
 
 bool EventLoop::wait(const std::chrono::steady_clock::time_point &time_point) {
-	return false;
+	if (event_port) {
+		event_port->wait();
+	}
+
+	while (head) {
+		if (!turn()) {
+			return false;
+		}
+	}
+	return true;
 }
 
-bool EventLoop::wait() { return false; }
+bool EventLoop::wait() {
+	if (event_port) {
+		event_port->wait();
+	}
+
+	while (head) {
+		if (!turn()) {
+			return false;
+		}
+	}
+	return true;
+}
 
 bool EventLoop::poll() {
 	if (event_port) {

source/async.h

@@ -173,6 +173,7 @@ public:
 	virtual Conveyor<void> onSignal(Signal signal) = 0;
 
 	virtual void poll() = 0;
+	virtual void wait() = 0;
 };
 
 class SinkConveyorNode;